Malicious PDF — malware analysis report

Static analysis result for SHA-256 45f67a4327dd346e…

MALICIOUS

PDF

86.8 KB Created: 2021-07-17 05:22:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 662b4afd72fd5a80bc33351ec502a22b SHA-1: 990c6950f735fc55f45c43b8c2652d3c2c12e1a0 SHA-256: 45f67a4327dd346e805877d76d703040fb8c92507293e3cfbfca8b6a530ba58f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. ClamAV and ML classifiers confirm its malicious nature, classifying it as a phishing trojan. The primary attack pattern involves luring users through a malicious attachment to a compromised site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/c6b24f8306da3dcab391adf5dd16cb60/13889219649.pdf In PDF document text
    • https://antae.be/app/webroot/uploads/file/xajiruxabebasisogawuda.pdfIn PDF document text
    • http://fornacedelia.it/userfiles/files/15104294490.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/fe6ce33aaedf2b9a5913d028902412cc/71541045654.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160be2a8f4175c---rulanenujona.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160a477f3684fe---6600950795.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/c40a8bfb5f1c24fbdb957fb4afe2b13f/81703290640.pdfIn PDF document text
    • http://comp-art.ru/userfiles/file/20889474031.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c5419b04c69---69655737929.pdfIn PDF document text
    • http://edgecs.net/documents/58277157559.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/ad752f1cab2159a7e00a848a65d1c27b/jexek.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/4708e8c82fefcb8d2dc740b0c35cacf5/80776436834.pdfIn PDF document text
    • https://interior-mark.com/ckfinder/userfiles/files/nigikududexevo.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/boxobovonokivugamajilufe.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/linisudepuxibep.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/e8fbdd021b807a79c70d5e5810458523/sopumegemuzuwiliduludume.pdfIn PDF document text
    • http://ncabhsa.com/clients/875427/File/82040364074.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/mkdthpcki61gdes6sm7p6qqr35/fapepimupabofixal.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/e9ofm231tlpfh7mdbi0lioisb2/45698565606.pdfIn PDF document text
    • http://cosmic-kino.ru/sadm_files/razibutemivozawawagovove.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/kubaravujagez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=structures+found+in+eukaryotic+cells+but+not+prokaryoticPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF96 17088 bytes
SHA-256: f66ccf241cad908e9f339984e90f719d9878f1f707815e5ca9abd0d9c2b1f814
font_01_sfnt_off00011c70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13487 11136 bytes
SHA-256: ab789ec77531e7ee3a743ce9004796ca8d70d272259d6e81d87a27af87628bcf

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